428 BRITISH SPECIES UNKNOWN AS IRISH. 



Three others have been twice procured in Great Britain ; — 

 Bulwer's tern, discovered in Madeira, and believed to be found 

 about the Canary Islands ; — ^teller's western duck, a native of 

 the more northern parts of Europe, x\sia, and jimerica;* — and 

 buffel-headed duck, a North American species. 



Five others have been very seldom met with ; — bimaculated 

 duck, a bird of Northern Asia ; very little is known respecting it 

 in any country ; — red-crested whistling duck, belonging to the 

 eastern and more southern haK of Europe, part of Asia, and North 

 Africa ;— harlequin duck, a northern species of Europe and Ame- 

 rica ; — laughing gull, a North American bird, found also along 

 the southern coasts of Europe ; — and Wilson's petrel, an inhabi- 

 tant chiefly of the North American seas. 



Two species found only in the eastern hemisphere (in Europe, 

 Asia, and Africa), are occasional visitants to England, which is the 

 western limit of their migration. These are the ferruginous or 

 Nyroca duck, and Caspian tern, both of which have been chiefly 

 met witli in the east of England. 



Wh«t has been said of the last two is equally applicable to the 

 gull-billed tern, witli the addition that it is now considered iden- 

 tical with a North American species, the <S'. aranea of Wilson. 



The remaining two have only of late years been recognized as 

 distinct species, lience their geographical distribution has yet to be 

 learned. Tliese are the Polish swan, which has been procured on 

 the Baltic Sea and the eastern coast of England ; and the pink- 

 footed goose in Erance, Holland, and Belgium, as well as Eng- 

 land and Scotland. 



Of the preceding sixteen species, three only have been obtained 

 in Scotland (Jard. ; Macg, ; Yarr.) ; — pink-footed goose, harle- 

 quin duck, and buffel-headed duck. Tlie Nyroca duck was once 

 procured by Sir William Jardine, in Edinburgh market, but it 

 was not known where it had been killed. 



It is considered unnecessary to go over the same ground 

 here in drawing inferences from the geographical distribution 



* At p. 118, the second individual (obtained since the publication of the 2nd edi- 

 tion of Yarrell's work) has been noticed. 



